I have a 267 Ohm resistor and 10 mH inductor in series. I am feeding the end of the resistor with output from a soundcard. All grounds are after the inductor. I am taking readings though my line in port and looking at them with xoscope. I have channel 1 plugged into the same spot as the function generator at the beginning of the resistor and channel two at the other end of the resistor at the inductor.
I take my readings on a sine wave with a frequency of 1k. Channel1 is at 1.24 V and channel 2 at 280 mV.
Get the phase shift with inverse cosine (C2 / C1) (C for Channel) and get 76.9 Degree's.
Next I get Inductive Reactance with Resistor * tan(Phase shift) and get 1.15K
Then I get the Inductance with (Inductive Reactance)/(2(pie)frequency) and end up with 183 mH!
Why don`t I end up with something close to the 10 mH I put in?